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Table 6 Parameters for the logistic equation of two cotton varieties’ (XLZ42 and XLZ45) dry matter accumulation in various treatments groups: Mulch film was removed at 1 and 10 days before the first irrigation (T1(June 4, 2015, June 19, 2016 and June 10, 2017), T10(May 25, 2015, June 9, 2016 and May 31, 2017), respectively) and 1 day before the second irrigation (E1(June 14, 2015, June 29, 2016 and June 20, 2017)) after seedling emergence, during 2015–2017. The control group (CK) was film mulched throughout the growth stage

From: Photosynthetic characteristics of cotton are enhanced by altering the timing of mulch film removal

Varieties and Years Treatments K a b R2 Tmax
/d
t1
/d
t2
/d
Rmax
/(kg·ha−1·d−1)
Wm
/(kg·ha−1)
Wt2-t1
/(kg·ha−1)
XLZ42, 2015 CK 28 448.19 4.5183 −0.0440 0.9813** 103 73 133 313.14 14 224.10 8 207.30
E1 13 546.26 3.6292 −0.0416 0.9780** 87 56 119 140.86 67 73.13 3 908.10
T1 98 03.42 3.7293 −0.0505 0.9566** 74 48 100 123.86 49 01.71 2 828.29
T10 13 098.11 4.1369 −0.0478 0.9955** 87 59 114 156.55 65 49.06 3 778.81
XLZ42, 2016 CK 15 233.50 4.8979 −0.0732 0.9866** 67 49 85 278.86 7 616.75 4 394.86
E1 15 730.68 4.9953 −0.0686 0.9889** 73 54 92 269.84 7 865.34 4 538.30
T1 18 790.06 4.4678 −0.0554 0.9953** 81 57 104 260.43 9 395.03 5 420.93
T10 11 573.49 5.2355 −0.0786 0.9933** 67 50 83 227.49 5 786.75 3 338.95
XLZ45, 2016 CK 26 514.86 3.9347 −0.0396 0.9467** 99 66 133 262.48 13 257.43 7 649.54
E1 19 615.03 4.7176 −0.0635 0.9969** 74 54 95 311.55 9 807.51 5 658.93
T1 30 025.95 4.2929 −0.0460 0.9612** 93 65 122 345.06 15 012.98 8 662.49
T10 15 532.38 4.5283 −0.0597 0.9794** 76 54 98 231.63 7 766.19 4 481.09
XLZ42, 2017 CK 19 068.20 4.3338 −0.0457 0.9728** 95 66 124 217.82 9 534.10 5 501.17
E1 24 279.73 4.5090 −0.0443 0.9943** 102 72 132 268.67 12 139.86 7 004.70
T1 12 510.99 4.3294 −0.0516 0.9790** 84 58 109 161.48 6 255.49 3 609.42
T10 20 762.82 4.7209 −0.0476 0.9964** 99 72 127 247.01 10 381.41 5 990.07
XLZ45, 2017 CK 14 775.97 4.5932 −0.0572 0.9719** 80 57 103 211.11 7 387.99 4 262.87
E1 14 817.38 4.6920 −0.0551 0.9969** 85 61 109 204.16 7 408.69 4 274.82
T1 18 182.35 4.6752 −0.0520 0.9915** 90 65 115 236.46 9 091.17 5 245.61
T10 12 452.72 4.8122 −0.0592 0.9940** 81 59 104 184.18 6 226.36 3 592.61
  1. Note: k, a, and b are equation coefficients
  2. Tmax, the time when the dry matter accumulation rate reached a maximum
  3. t1, starting time of linear accumulation
  4. t2, end time of linear accumulation
  5. Rmax, the maximum accumulation rate
  6. Wm, dry matter weight at the time when the dry matter accumulation rate reached a maximum
  7. Wt2-t1, dry matter accumulation from t1 to t2. R2, Correlation Index
  8. * Significant at the 0.05 probability level. ** Significant at the 0.01 probability level